一些DCS常见故障的处理。
报警故障:DCS控制系统一些点设有报警信号,处理报警信号时要分清楚报警类别,如:罐里没有液位,造成液位低报,现在要分析低报的原因,进液阀没动作,调节关系值设定不好,液位变送器测量不准,还是液量太小等因素,按检查的结果具体处理。
操作站死机:激活操作站就行了。
接线端松动:定期紧固螺丝。
数字万用表和信号发生器的使用:
数字万用表的使用:2N3A3620-B
数字万用表的位数确定:常见数字万用表有31/2位、32/3位、33/4位、41/2位等等,一般31/2位至41/2位数字万用表是便携式,51/2位以上为台式。31/2位显示值从0000至1999,32/3位显示值从0000至2999,33/4位显示值从0000至3999。
数字万用表的分辨率:分辨率式数字万用表末位一个数字所代表的物理量值;分辨率随量程的增大而成比例增大。例如:DT-930-F直流电压200mV档的分辨率为10μV,而2V档的分辨率为100μV。
自动量程转换的特点:一些中高档的数字万用表在测量时能够自动转换量程,使测量误差减小,使用很方便。但每次测量都从最大量程开始,逐渐减少到合适量程,当所测量值较小时,读数等待时间较长。
数字万用表与指针式万用表比较的特点:准确度高;读数方便;灵敏度高;使用方便;测量范围广;过载保护;测量电压或电流时,对电路状态影响小。
怎样测电压:2N3A3620-B
将黑表笔插入“COM”孔中,红表笔插入“V/Ω”孔中。
把量程开关拨到合适量程位置,表笔与电源或负载并联进行测量;
测电流:2N3A3620-B
将黑表笔插入“COM”孔中,红表笔插入“A”孔中(被测电流200mA以下)或插到“10A”插孔中(被测电流在200mA至10A之间);
先把量程开关拨到合适量程位置,表笔与负载串联进行测量;
怎样测电阻:2N3A3620-B
将黑表笔插入“COM”孔中,红表笔插入“V/Ω”孔中;
把量程开关拨到合适量程位置,表笔与负载并联进行测量;
在测量电阻时,确保切断电路电源。
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